Go Back  RCU Forums > RC Airplanes > Electrics to Glow Conversions
Reload this Page >

Gulliows Cessna 172 Glow conversion question

Notices
Electrics to Glow Conversions Are you converting an electric airplane to glow and need help? Have you already converted an airplane and you want to show it off and give some tips? This is your forum. Enjoy.

Gulliows Cessna 172 Glow conversion question

Old 10-09-2022, 12:11 PM
  #1  
SOPHIAFLYGIRL
Member
Thread Starter
 
SOPHIAFLYGIRL's Avatar
 
Join Date: Aug 2022
Location: Wyoming
Posts: 49
Received 9 Likes on 7 Posts
Default Gulliows Cessna 172 Glow conversion question

Hello I'm a giant scale Pilot and have absolutely no idea about what tiny glow engine will fit this plane:


I own and fly big airplanes. The smallest one I own is a CMP Pro Cessna 182 with a DLE 20. Since I have no previous experience with 36 inch wingspan planes, thought it would be kinda cool to try something really small and see if how it flies. I don't really want to put an electric motor in this plane but I'm not opposed to it. The box calls for a .049 engine or rubber band power. I'm thinking a .10 to .15 size glow engine would probably be perfect for something this tiny.
Any input I'd appreciate, thanks.

Sophia
Old 10-10-2022, 05:00 AM
  #2  
rgburrill
 
rgburrill's Avatar
 
Join Date: Dec 2010
Location: Dallas, Tx CT
Posts: 2,866
Received 76 Likes on 67 Posts
Default

It says right on the box .049
Old 10-10-2022, 05:43 AM
  #3  
speedracerntrixie
My Feedback: (29)
 
speedracerntrixie's Avatar
 
Join Date: Jun 2010
Location: Happy Valley, Oregon
Posts: 9,527
Received 177 Likes on 152 Posts
Default

IMO an 049 would be marginal. The other issues is noise and the fact that 049 will spit exhaust everywhere. A better option would be a 10 fsr with a muffler to direct the exhaust and a real carburetor.
Old 10-10-2022, 09:17 AM
  #4  
Outrider6
Senior Member
My Feedback: (2)
 
Join Date: Apr 2020
Location: Metro Atlanta GA, USA
Posts: 404
Likes: 0
Received 33 Likes on 29 Posts
Default

I agree that a .10 would be a much better choice, and that an .049 would probably be marginal.

There are many other considerations and design changes that you will have to do, since the plane wasn't really designed to be powered by an engine, but a rubber band, instead. I imagine the firewall (if there even is one) will probably have to be beefed-up, as well as some of the fuselage structure to which the firewall attaches.

And then the balance issue, where I imagine you would have to mount all of the radio gear as far rearward as possible.

The kit may not even come with operable control surfaces. In that case, some serious design changes would be required.

I'm not sure how available fuelproof dope, etc. is anymore - something else to consider.

I'm just guessing on most of this, because I haven't built that type of kit in over 45 years, and I recall very little. I have thought of doing a project like this, as there are some very cool kits out there that could become incredibly cool small r/c models. But I realized all of the challenges, and didn't want to just jump into it.

I imagine quite a few people have attempted a project like this, so hopefully they will eventually chime in and give their experiences.

I love seeing the hobby of building r/c planes staying alive. This aspect of the sport is dwindling away and dying, but some of us are trying to keep it alive. In other words....you go, girl!!!
Old 10-14-2022, 07:46 AM
  #5  
EF
 
Join Date: Feb 2005
Posts: 519
Received 15 Likes on 13 Posts
Default

The reason they suggest an 049 is that these engines have an integral fuel tank and are relatively easy to install.
Anything larger would require you to redesign the structure to accommodate a tank, plumbing, and some kind of access to it all. Also need to strengthen it for the increased weight.

By the time you’ve done that, probably the weight increase (wing loading) will be significant.
Not saying an accomplished model designer and builder couldn’t do it, but emphasis is on experience in such.

The rest of the delicate structure should also be carefully reviewed for its suitability to an ic engine.
Making successful ic flying models at these sizes is more difficult than the larger or giant size models, and today e power does seem more practical for them.
Old 10-15-2022, 06:14 PM
  #6  
SOPHIAFLYGIRL
Member
Thread Starter
 
SOPHIAFLYGIRL's Avatar
 
Join Date: Aug 2022
Location: Wyoming
Posts: 49
Received 9 Likes on 7 Posts
Default

Originally Posted by Outrider6
"I love seeing the hobby of building r/c planes staying alive. This aspect of the sport is dwindling away and dying, but some of us are trying to keep it alive. In other words....you go, girl!!!"
I'm definitely doing my part to keep building and flying from dying off all together. Thanks for the encouragement!! 2022 marks 35 years I've been flying RC, think I'll go for another 35!💜💜
Old 03-21-2023, 03:48 PM
  #7  
1967brutus
Senior Member
 
Join Date: Oct 2021
Posts: 1,234
Received 76 Likes on 71 Posts
Default

??? a .049 marginal?

IIRC the Cox original Cessna Centurion was 36" wingspan, and was pretty adequately powered with a .049...
Old 03-22-2023, 08:25 AM
  #8  
mgnostic
 
mgnostic's Avatar
 
Join Date: Jan 2003
Location: Kamay, TX
Posts: 1,603
Received 88 Likes on 76 Posts
Default

The answer is: it depends. What do you want from the airplane? I have a Cox Centurion of the same size and mentions by 1967brutus and can confirm it flies nicely as a two channel airplane. Fuel proof dope is still available through Brodak. If you don't want to mess with dope and tissue, iron on covering is still a thing. When dealing with things like the Guillows kits it is important to remember that most of them were designed in the 1960's and 70's. Radios have come a long way. Receivers are much smaller. You can use good quality micro servos on an .049 plane and mini servos up to a .15. Guillows planes also have a construction style that as noted above can be kind of fragile and you will have to do some re-engineering for control surfaces etc. So, yes an .049 can be made to fly the airplane just fine. If you want throttle and any amount of scale detail then step up to an .07-.10 engine. A throttled Norvel .049 could also be nice.
Old 03-22-2023, 01:23 PM
  #9  
kmeyers
 
kmeyers's Avatar
 
Join Date: Jan 2004
Location: lake in the Hills, IL
Posts: 981
Likes: 0
Received 15 Likes on 15 Posts
Default

Sophiaflygirl
So was this a winter project, is it under way, finished, choices made?
Just saw this today, here is my two cents.
under 4 lbs: electric.
over 8 lbs: gas
4 - 8 lbs glow might work under review of needs and use.
36" wingspan gillows, no question at all today.....electric!

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Thread Tools
Search this Thread

Contact Us - Manage Preferences - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service -

Copyright © 2024 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.